Why does your Rhododendron japonicum have white cottony spots? Diagnose the cause and fix it with our step-by-step guide.
These small insects secrete a white, waxy, cottony substance to protect themselves while feeding on the sap of your Japanese Azalea. They often congregate in crevices between leaves or near new growth buds.
Similar to mealybugs, these pests produce a white, felt-like covering over their bodies. They attach themselves firmly to the stems of the Rhododendron, often causing leaf yellowing due to sap depletion.
While lace bugs are known for stippling leaves, the accumulation of discarded skins (exuviae) or egg masses can sometimes appear as light, white, or dusty debris on the leaf surface.
This fungal pathogen manifests as a white, flour-like coating on the leaves and stems. It thrives in high humidity and poor air circulation around the dense foliage of Japanese Azaleas.
Your plant might also be experiencing one of these issues:
English
Italiano
